Because there are many cars in Chengdu, the number of cars in Chengdu is the third in the country, and the traffic planning in many places in Chengdu is unreasonable, so many places can't turn left. Moreover, Sichuanese are in a hurry and don't know if there will be traffic jams soon, so they must squeeze in, just as they are afraid that someone will grab his position. So in summary, there are many cars and the traffic planning is unreasonable.